For all those who were keen to see a 2x1 pipe setup, here it is! Took a lot of figuring out but think this works.
The best part is, there is no clamp joint needed to connect the rear branch to the main pipe, the whole thing is one single unit, while allowing the individual headers to enter each exhaust port simultaneously. Pipes are secured extremely well through 6061 clamp rings held to studs installed in the heads, a detail that every Musket engine has had.